Process and system for returning pulverized coal

Abstract

The invention discloses a process and system for returning pulverized coal, which belongs to the field of blast furnace coal injection. The process is to use a pulverized returning pipeline to realize the mutual transportation of pulverized coal between coal injection systems, including: a coal injection system for judging that the pulverized coal is surplus and pulverized coal deficient coal injection system; lead out the surplus pulverized coal in the pulverized coal surplus coal injection system; use the pulverized coal surplus pulverized coal injection system to inject the surplus pulverized coal; The surplus pulverized coal enters the pulverized coal deficient coal injection system through the pulverized return pipeline. Its system includes: the powder return pipeline, which is used to connect each coal injection system with each other, and is composed of a main pipe, an upper branch pipe and a lower branch pipe. By adding a powder return pipeline and using the principle of direct injection, the present invention realizes that coal powder can be transported between various coal injection systems, solves the problem that the coal powder of each coal injection system cannot be transferred to each other, and at the same time can effectively avoid a certain blast furnace due to Long-term non-injection of coal will cause the pulverized coal bunker in the coal injection system or the pulverized coal at the bottom of the coal injection tank to compact.

Description

technical field [0001] The invention belongs to the technical field of blast furnace coal injection, and relates to a pulverized coal returning process and system. Background technique [0002] Blast furnace pulverized coal injection systems use high-pressure gas (nitrogen or air) for pressurization, fluidization and transportation, and each injection cycle generally consists of "powder loading-pressurization-injection-pressure release-powder loading". At present, there are multiple blast furnaces in large iron and steel enterprises. Basically, one blast furnace corresponds to one set of coal injection system. Therefore, multiple blast furnaces also have multiple sets of corresponding coal injection systems. Often, each set of coal injection system also has a separate coal powder warehouse. Supply the required pulverized coal. When the pulverizing system of this coal injection system fails, the production capacity is insufficient and other factors cannot meet the continuous ...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a process and system for returning pulverized coal, so as to realize the transportation of pulverized coal between the coal injection systems, solve the problem that the pulverized coal of each coal injection system cannot be transferred to each other, and effectively avoid The pulverized coal compaction at the bottom of the pulverized coal bunker and the injection tank caused by the long-term stop of coal injection in a certain blast furnace

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